Skip the auto shop - Our mechanics make house calls

Q: Kia Cerato 2011 jerks when accerating

asked by on

When I initiate drive and accelerate the engine, the car jerks. I also noticed the check engine light comes on and blinks. As I get to about 50Km/Hr I hear a humming sound too with some vibration. It is more eminent when I am using the car air conditioning system and / or the rear screen heater.

Your car’s engine intake system has something called a mass air flow sensor that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This may cause a hesitation, loss of power or jerking reaction when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Cutting out won't start

Hello. If you're getting proper fuel, and the alternator and starter are working as they should, I would check for loose wiring related to the alternator and battery and I will also test the battery to make sure that it is...

Q: I have a p0174 code that was reviewed on a scanner.

Hi there. The code P0132 in on for an issue with the upstream oxygen sensor. There could be a broken wire, frayed wire touching something metal, or the sensor could have failed. The code P0174 is on for the Mass...

Q: Charging system

Hi There, it sounds like you may have a problem with your charging system maintaining your battery. You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.